The most common pairing is Numa, Joraga Chieftain, but I prefer Thrasios, Triton Hero (one of Magic's best merfolks) or Tana, the Bloodsower for a better color identity
Since it has storm, you get a token copy of the aura for each previous spell cast, letting you buff your whole team or stack multiple auras on a single threat
One my favorite cards from the art to effect I just love this card 5
If your opponents are still standing, you can simply repeat the process on your next attack, making it incredibly difficult for them to break through your defenses
Swords to Plowshares by Liiga Smilshkalne
Clones nearly always leave you with the best creature in play, or at least in control of a duplicate of the actual best creature